gdb/umax-xdep.c

   1 /* umax host stuff.
   2    Copyright (C) 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
   3
   4 This file is part of GDB.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20 #include <stdio.h>
  21 #include "defs.h"
  22 #include "frame.h"
  23 #include "inferior.h"
  24
  25 #include <sys/param.h>
  26 #include <sys/dir.h>
  27 #include <signal.h>
  28 #include <sys/ioctl.h>
  29 #include <fcntl.h>
  30
  31 #include "gdbcore.h"
  32 #include <sys/ptrace.h>
  33 #define PTRACE_ATTACH PT_ATTACH
  34 #define PTRACE_DETACH PT_FREEPROC
  35
  36 #include <sys/file.h>
  37 #include <sys/stat.h>
  38
  39 /* Work with core dump and executable files, for GDB.
  40    This code would be in core.c if it weren't machine-dependent. */
  41
  42 void
  43 core_file_command (filename, from_tty)
  44      char *filename;
  45      int from_tty;
  46 {
  47   int val;
  48   extern char registers[];
  49
  50   /* Discard all vestiges of any previous core file
  51      and mark data and stack spaces as empty.  */
  52
  53   if (corefile)
  54     free (corefile);
  55   corefile = 0;
  56
  57   if (corechan >= 0)
  58     close (corechan);
  59   corechan = -1;
  60
  61   data_start = 0;
  62   data_end = 0;
  63   stack_start = STACK_END_ADDR;
  64   stack_end = STACK_END_ADDR;
  65
  66   /* Now, if a new core file was specified, open it and digest it.  */
  67
  68   if (filename)
  69     {
  70       filename = tilde_expand (filename);
  71       make_cleanup (free, filename);
  72
  73       if (have_inferior_p ())
  74         error ("To look at a core file, you must kill the inferior with \"kill\".");
  75       corechan = open (filename, O_RDONLY, 0);
  76       if (corechan < 0)
  77         perror_with_name (filename);
  78       /* 4.2-style (and perhaps also sysV-style) core dump file.  */
  79       {
  80         struct ptrace_user u;
  81         int reg_offset;
  82
  83         val = myread (corechan, &u, sizeof u);
  84         if (val < 0)
  85           perror_with_name (filename);
  86         data_start = exec_data_start;
  87
  88         data_end = data_start + u.pt_dsize;
  89         stack_start = stack_end - u.pt_ssize;
  90         data_offset = sizeof u;
  91         stack_offset = data_offset + u.pt_dsize;
  92         reg_offset = 0;
  93
  94         bcopy (&u.pt_aouthdr, &core_aouthdr, sizeof (AOUTHDR));
  95         printf ("Core file is from \"%s\".\n", u.pt_comm);
  96         if (u.pt_signal > 0)
  97           printf ("Program terminated with signal %d, %s.\n",
  98                         u.pt_signal,
  99                         u.pt_signal < NSIG
 100                         ? sys_siglist[u.pt_signal]
 101                         : "(undocumented)");
 102
 103         /* Read the register values out of the core file and store
 104            them where `read_register' will find them.  */
 105
 106         {
 107           register int regno;
 108
 109           for (regno = 0; regno < NUM_REGS; regno++)
 110             {
 111               char buf[MAX_REGISTER_RAW_SIZE];
 112
 113               val = lseek (corechan, register_addr (regno, reg_offset), 0);
 114               if (val < 0)
 115                 perror_with_name (filename);
 116
 117               val = myread (corechan, buf, sizeof buf);
 118               if (val < 0)
 119                 perror_with_name (filename);
 120               supply_register (regno, buf);
 121             }
 122         }
 123       }
 124       if (filename[0] == '/')
 125         corefile = savestring (filename, strlen (filename));
 126       else
 127         {
 128           corefile = concat (current_directory, "/", filename, NULL);
 129         }
 130
 131       set_current_frame ( create_new_frame (read_register (FP_REGNUM),
 132                                             read_pc ()));
 133       select_frame (get_current_frame (), 0);
 134       validate_files ();
 135     }
 136   else if (from_tty)
 137     printf ("No core file now.\n");
 138 }